A compilation of credible UFO sightings that have occurred in the 21st century, providing evidence and accounts from reliable sources.

Click chemistry is being used to develop new drugs that can specifically target cancer cells. This method allows for the creation of molecules that can selectively bind to cancer cells, leading to more effective and less toxic treatments for cancer patients.

Robert Watson-Watt was an engineer and inventor who is credited with developing the first practical radar system during World War II. His work revolutionized air defense and helped to win the war.

The process of making a microchip involves creating a semiconductor wafer, adding layers of material and using photolithography to etch microscopic patterns onto the surface. This is followed by doping and metallization to create transistors, wires, and other components, and then testing and packaging.

The first microchip, also known as an integrated circuit, was invented in 1958 by Jack Kilby at Texas Instruments and Robert Noyce at Fairchild Semiconductor. It revolutionized electronics, enabling the creation of smaller, faster, and more powerful computers, smartphones, and other devices.

The transistor was invented in 1947 by William Shockley, John Bardeen, and Walter Brattain at Bell Labs. It revolutionized electronics, replacing vacuum tubes and enabling the development of smaller, faster, and more reliable devices, leading to the creation of modern computers and other electronic devices.

Vacuum tubes, also known as thermionic valves, were first developed in the late 19th century and revolutionized electronics, enabling the creation of early radios, televisions, and computers. They were eventually replaced by transistors in the mid-20th century.